Menu twentyten and nextgen

I have a problem the menu of template twenty ten (in combination with nextgen) is messed up in ie windows xp. It works well in Firefox with windows 7. With these settings the menu pushes down the menu bar. If I put in
position: absolute; the menu disappears behind the pictures (of nextgen).
What can I do to make it work in both browsers and op systems?

thanks Renee

#access ul ul {
	box-shadow: 0px 3px 3px rgba(0,0,0,0.2);
	-moz-box-shadow: 0px 3px 3px rgba(0,0,0,0.2);
	-webkit-box-shadow: 0px 3px 3px rgba(0,0,0,0.2);
	display: none;
	position: relative;
	top: 38px;
	left: 0;
	float: left;
	width: 180px;
	z-index: 2;